Cookie Policy

Fern sets three cookies of its own and keeps a few settings in your browser. Here is exactly what and why, then the policy in full.

Last updated October 18, 2026

What is on your device

Sign-in sessionUntil you sign out
Keeps you signed in. Set by our sign-in service (Supabase). Needed for the app to work at all.
floor-device1 year
A random id for this browser or app install. It lets us email you the first time a device signs in to your account, and lets moderators see when two accounts share a device. Needed for security.
floor-seen7 days
Remembers that you scrolled past your own newest post, so the feed doesn’t pin it again.
Browser storageUntil you clear it
Your theme, your saved sign-ins for switching accounts, whether notifications and analytics are on, a bandwidth estimate for video quality, and whether the opening animation ran this session. None of it leaves your device.
AnalyticsNo cookie
Vercel Web Analytics and Speed Insights count page views and load times. Nothing is stored on your device and no cookie is set. You can turn it off in Settings → Preferences.
Other sitesTheir rules
Logos, coin art, cover photos, video and charts load from Logo.dev, CoinGecko, Unsplash, Cloudflare and TradingView. They see your IP address, like any site you load pictures from; the chart frames may set their own cookies.

1What cookies are

A cookie is a small file a website keeps in your browser so it can recognise it next time. Browser storage does the same job for settings that never need to reach the server. This policy covers both, on the Fern website and in the Fern app.

2The ones Fern uses

Only the ones listed above. Each one either keeps Fern working and your account secure, or remembers a setting you chose. None is for advertising, none follows you to other sites, and our usage counts set no cookie at all.

Since they’re needed to sign in and to protect your account, we don’t ask before setting them, which is what the law allows for cookies like these.

3Other companies

The price charts are TradingView’s, drawn in a frame from its own site, and it may set its own cookies there under its own policy. Pictures and video load from Logo.dev, CoinGecko, Unsplash and Cloudflare, which see your IP address like any site you load a picture from, but set no cookies for us.

4Your choices

  • Usage counts: off in Settings → Preferences.
  • Clearing or blocking cookies in your browser’s settings works, but Fern can’t keep you signed in without its sign-in cookie, and the next sign-in looks like a new device, so we’ll email you about it.
  • Do Not Track and Global Privacy Control: Fern doesn’t track you across sites, so there’s nothing for them to switch off, and we honour them anyway.

5Changes

When we add or remove a cookie, this page changes first, and so does the date at the top.

6Contact

Questions about cookies go to thefern.app@gmail.com.

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Questions? thefern.app@gmail.com